Stupid way to substract a Spark RDD from another using right outer join

gistfile1.py

aaa = sc.parallelize( [1,2,3,4,5,6,7,8,9])
bbb = sc.parallelize( [1,3])

print ( aaa.map(lambda k: (k,k))
           .leftOuterJoin(bbb.map(lambda k: (k,k)))
           .collect() )

print ( aaa.map(lambda k: (k,k))
           .leftOuterJoin(bbb.map(lambda k: (k,k)))
           .filter(lambda k: k[1][1] == None)
           .map(lambda v: v[0])
           .collect() )

The fist print() is really important to realize how ugly is what we're doing here.
=sob=